Let's talk about the escape characters in php

In PHP, escape characters are a very important concept. They allow us to insert some special characters into the string, which are characters with special meaning in programming languages, such as single quotes, double quotes, backslashes, etc. These characters are called "escape characters" in strings, and they themselves begin with a "\" symbol.

In PHP, there are a total of eight escape characters, namely: \, ', ", n, r, t, $ and

. Let's introduce them one by one below .

1. Backslash (\): used to escape some special characters, such as single quotes, double quotes, backslashes, etc.

Example 1: Output Double quotes contained in "hello world"

echo "hello \"world\"";
?>

Example 2: Output "It's a beautiful day" contains single quotes

echo 'It\'s a beautiful day';
?>

2. Single quotes ( '): used to indicate the beginning and end of a string.

Example: Output "hello world"

echo 'hello world';
?>

3. Double quotes ("): Similar to single quotes, they are also used to indicate the beginning and end of a string, but can contain variables.

Example: Output "My name is Jack"

$name = "Jack";
echo "My name is $name";
?>

4. Newline character (n): used to represent a newline character.

Example: Output "hello" and "world" on one line respectively

echo "hello\n";
echo "world";
?>

5. Carriage return character (r): Similar to the newline character, it is also used to represent a newline character, but it is processed differently in different environments.
6. Tab character (t): Represents a tab character.

Example: Output "Name: Jack, Age: 25"

echo "Name:\tJack,\tAge:\t25";
?>

7. Dollar sign ($): used to reference variables and represent the value of the variable.

Example: Output "My name is Jack, I am 25 years old."

$name = "Jack";
$age = 25;
echo "My name is $name, I am $age years old.";
?>

8. Null character (): used to represent null characters, also Can be used as the end symbol of a string.

Example: Output empty string

echo "";
?>

The above is what is used in PHP A detailed introduction to the eight escape characters. Understanding these escape characters can help us better master PHP's string operations. At the same time, we also need to pay attention to a detail issue. When using single quotes (') to represent a string, the escape characters will not be parsed and need to be escaped manually; while using double quotes (") to represent a string time, the escape characters will be automatically parsed.

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